<template class="mainBack">
  <div>
  <el-container >
    <el-header class="homeHeader">
      <div class="title">在线学生管理系统</div>
      <div>
        <el-dropdown class="userInfo" @command="commandHandler">
          <span class="el-dropdown-link">{{user.name}}<i><img src="../assets/驯龙高手-崔斯塔娜.jpg"></i></span>
          <el-dropdown-menu slot="dropdown">
            <el-dropdown-item command="userinfo">个人中心</el-dropdown-item>
            <el-dropdown-item command="logout">注销</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
    </el-header>
    <!-- -->
    <el-container>
      <el-aside width="200px">
        <el-menu router unique-opened> <!--动态添加菜单栏要先加router-->
          <el-submenu :index="index + ''"
                      v-for="(item,index) in routes"
                      :key="index"
                      v-if="!item.hidden">
            <!--routes是index.js里面全部的routes，包含了login，这里显示不为hidden的-->
            <!--v-for(item,key) in a 为键值对用法，需要绑定key ：key-->
            <!--9行在使用computed后删除 this.$router.options. -->
            <template slot="title">
              <i :class="item.iconCls" style="color:#1accff; margin-right: 5px;"></i>
              <span>{{item.name}}</span><!--拿到routes的name属性-->
            </template>
            <el-menu-item-group>
              <el-menu-item :index="children.path" v-for="(children,indexj) in item.children">
                <!--这里的children是index,js里面home的children-->
                {{children.name}}
              </el-menu-item>
            </el-menu-item-group>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main >
        <el-breadcrumb separator-class="el-icon-arrow-right" v-if="this.$router.currentRoute.path!='/home'">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>{{this.$router.currentRoute.name}}</el-breadcrumb-item>
        </el-breadcrumb>
        <div class="homeWelcome" v-if="this.$router.currentRoute.path=='/home'" >
          欢迎使用学生在线管理系统！
        </div>
        <router-view class="homeRouterView"/>
      </el-main>
    </el-container>
  </el-container>
  </div>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      Url:'http://localhost:8080/ipfsemc'
      //user: JSON.parse(window.sessionStorage.getItem("user"))
    }
  },
  computed:{
    routes(){
      //从vueX里面拿到router
      return this.$store.state.routes;
    },
    user(){
      return this.$store.state.currentAdmin;
    }
  },
  methods:{
    commandHandler(cmd) {
      if (cmd == 'logout') {
        this.$confirm('此操作将注销登录，是否继续？', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          //注销
          this.postRequest("/logout");
          //清除用户信息
          window.sessionStorage.removeItem("user");
          window.sessionStorage.removeItem("tokenStr");
          //清空菜单，防止不同id获得相同菜单
          this.$store.commit('initRoutes', []);
          //跳转登录页
          this.$router.replace("/")
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消操作'
          })
        })
      }
      if (cmd == 'userinfo'){
        this.$router.push('/userinfo');
      }
    }

  }
}
</script>

<style scoped>
.mainBack{
  background-image: url("../assets/back.jpg") ;
  background-size: cover ;
}
.homeHeader {
  background-color: #409eff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0px 15px;
  box-sizing: border-box;
}

.homeHeader .title {
  font-size: 30px;
  font-family: 华文行楷;
  color: #ffffff;
}

.homeHeader .userInfo {
  cursor: pointer;
}

.homeWelcome {
  text-align: center;
  font-size: 50px;
  font-family: 华文行楷;
  color: #409eff;
  padding-top: 50px;


}

.homeRouterView {
  margin-top: 10px;
}

.el-dropdown-link img {
  width: 48px;
  height: 48px;
  border-radius: 24px;
  margin-left: 8px;
}

.el-dropdown-link {
  display: flex;
  align-items: center;
}
</style>